Mounts filesystem-images by right-clicking. ImageMounter can be used as an add-on or by selecting it as an application out of the Tracker's "Open With..." menu. Supported are BFS, HFS, DOS and ISO9660 images. If ImageMounter is double-clicked, a small window pops up where you can drop the image file.

Available on HaikuWare: http://haikuware.com/directory/view-details/system-files/tracker-add-ons/imagemounter